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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98a17f39d21a52d85e5a4317d0bed640895b3eed7b2329ef287d2dee672a1dc' 
  AND token = 'wKcbcN0Y3dJVfhaxU54+YNJSX0GqN5jPxgEuAwNZsGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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