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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918edd1c5f550ba99348f49dc39811f925b1e40aecc88cc15418ef9b4ce32afa' 
  AND token = '8r/wvDOIp+CK8IOCenHo9x0j7do2Jn+f6/LhBKCMrvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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