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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f436d837892f1c5d6eb0cf4cc3c2c977e6e38ab57def4ac3d350d0e5e8764b4c' 
  AND token = 'yneR+wXgR26K3nrxKKqM0sBzp5iOJ4WAchgd9/Xt8OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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