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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e7b64b2d227895775eddcaec05a13f7d9ce676479fb8f85274ef19ce0b864c' 
  AND token = '5lff281QUgFi9vr5pzQX5lheOJZ2jcmCOTkl+xcyR5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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