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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41a310855a212236eee4dfd743dd89382f87697788950f5fb0b5d949f89ff2e' 
  AND token = 'D09z6FQJqZ3ncpRB3xy4Dr+wHWbrPyRydk1gUkYAzkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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