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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce07138fc3eda94e0d2d4fc897602d027530652e8bb240076461b5b93b90bd0c' 
  AND token = '/lolh/omuj0n0eJlfmVjGID7IddysZOqAlbtQpRbQ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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