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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfe0e30d5c2adfc83a68486a88496bf6caa2568e57c151ec628a801e1e776a2' 
  AND token = 'agU+mfuw7oVSNDGRH+qgi55bHdvqAx0tXKRfBiw3PIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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