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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84edac890e331687fa8c23b476d36a75b324b24272fa4a09d573fd9729d4ecb2' 
  AND token = 'FJnFJuBUcPM2Heh0C/Jbkp84eQHBb+7vifHYzmQp5No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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