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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c041c867ab7056008abd12636581078fc156b57adc33d02973cf07183079fa' 
  AND token = '0QaaRP84J8Wt471/W2eiJi6QQ7u2A7QBynCXulYYmbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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