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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cee12c369cf7876bcac84501cd6e62d0ce81984f43d4444b05f73e28e25665' 
  AND token = 'LO9/a2/skRae3uLgkOFUBiwq9wip+isnyMqrnlpXHBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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