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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2455ba260118ce773fa535ae3c8737031af13a1a059287cdc9f71dcd417206' 
  AND token = 'lC2XVhNMIb8Zqj+90Ht4z5sDAM1/GFAttMtnQiJVhi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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