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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5432b0a9a8d45827e4029f6fcc5aa2f4ba2c9a535edbb8d54881d430960162' 
  AND token = '3feIxJX+rHIY28avJc9lyMZH09HDUueuhIpiQ2QGP2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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