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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9cc92732fcfe12a83dce7079846fba3a7153dc36e8409d24bc6cb89805350e' 
  AND token = 'SdVtLBsHK7KytZSQ59GB2ko/DsqI66dF/oS5mRj7gyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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