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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e94a8a270fbe61bc903b400b6ae54c2bede74469d3e9fcc3047b690989338a3' 
  AND token = '2ZSd989P+XYvjrbGf73rbV3TkA77Lhm1TlqFjV48XhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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