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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c91b8b5b2977fd1cfcb99fa4993c4ab1519e7aad8e215ca6ae2f781d195dcc' 
  AND token = '2t7vg22Far5gLBXZp2uMcHCPs3QkQ/kPOq3BQqnkN6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}