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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf71a1deb2d50ca88be18f37b0aa3773222e7fe89e7dc7a039f626642ed177ee' 
  AND token = 'dh+qtEcnOEiDF0ULdFsTn9sE3Q7feqL0JdwyWtGHkcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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