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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5440ae5bcccec02ec7cd5467de72f847a26347a2ec78164e12516a1098975119' 
  AND token = 'r7tWWDifpvq4eF20aq4p4hlGVxoVDCP4/nACHTY9yfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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