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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e9fefaa745bbf2720478c3e6ff7372b7db707f543acea86975ef96467aefd1' 
  AND token = 'UMWQ2tSFoF72seT4uk0ngCNlAbfskeVGpYnsPfKfH5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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