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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19b8a9dbb2a21b56d4e30e674200513ff7d5a0361d034dfdec791023d696f7d' 
  AND token = 'RzhzrSnn5Riu8Dt06v7E1p6JjILe+l6YpJe5YyXsdzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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