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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b79cfa160f74fd600e2838bee59ecba74ecae6c186ecb3b8a495f53e5f7d2ee' 
  AND token = 'XJ84Ir3aIQGhN/vQkmUa0RsnYpqs3jYGxcIVzJvqsAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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