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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9c4d9a1529d5ee9ac6519fedc6ccb0016f76f6029f997810671c92ac556721' 
  AND token = '6bjGpLJb36nFnDAt2b+pnfIK22i2tCYoX7BVYqbczdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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