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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6b1ec17931d27556ab86d3aaea31e5510852918b703354476ae90f22e87df7' 
  AND token = 'eQkRnmA3mU1A0Q4pyc/XzIihTRivLi5g2i8bVHUUUqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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