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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda5e5674416a86d8e2a08be8f84bd38ad0dc0a51c9f5cd3f02dd7c1be80bd99' 
  AND token = 'InSFgLuNJGRzRw0SDsK2pdNeVT0j8CzE2PEZUmwDbrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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