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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139d03138db6f0cff94e5d793925a8d81646567bb3d34bb16098e45dc66df836' 
  AND token = 'H4AwCfkt9sJnUaMj/Ymxu0t2ImHlOgSa69dKE9V2wdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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