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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdaee90281e9f2c1690c69c0eec2a5d2d601bd6a1587c1ead9f53f27f880b4c' 
  AND token = 'rsfXsSK/5dwIoEHeHHRba1Z94hol35AtNVxKYYSid5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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