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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10a46a108e2302c3bd19097bcfbe43c3dcffaeb33820eebd158bd98ca66f64b' 
  AND token = 'FKkLwasbDy/Y616xz9GAJtvAB4jKZnsks7k9iUynK5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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