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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc66511615388473f696853dab65f4d6f430ef6b5ea4868655094bd9060608b' 
  AND token = 'hncmb9/zBmUfhltw/20tIhC3rz5gfy/Qu6O481/bQs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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