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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffaec62543c1a25d6dc734fbaf85bc31246c3b6f972e3aff5f6fc4ab5760e41b' 
  AND token = 'A/jss280XU0yaK8GBcnkJj7ozBVb+V8ZTNEhxZ7L9Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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