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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02a75bd124f9495b5c2757b1277aa1ce701706684e8e97078dcd6563717a05c' 
  AND token = 'fJ3OndpNEgESTJskY8Dfh30JAnpXu5rtOAo2IapzCVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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