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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d6cb005e07f50d157e863b1d6c50bf0d351cc69d7e5134b1f7f79beb8e86b5' 
  AND token = 'DgPo1PNZUv7EbwDLWSjlXlHawUcNnoBxfkA/ek3lm1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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