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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e074531103de6f5761a84248b557e3ee27292aff12273aa59f3f1f66a64becdc' 
  AND token = 'Jia7Q6aCUw6/8KWNH2o4yqFYCMNNwvhe1EP7HudsfPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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