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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad89490e5a68193ed98177a7f3d309add9c8bc342c4c2a96c6aa5381cf97e9a' 
  AND token = 'toB7px/yluKptzAVQcf2fDMe88h7kG7ms3jQtjJNa2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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