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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a5ca4c6afa001d85106d93649f89ed256c4e1bed60473f8c2b6450c76724fe' 
  AND token = 'SlPQp0rPyEnV/M995MPWuCKSsXhOzWzLMWp3PQklFI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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