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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b21b3d2dd99b192bb28c78f2cb85e31632457c0cd132ee96831485125c0ba7' 
  AND token = 'ZRd/+WEDi0rhzQr8nOwo5MfXgoh6JkdGsvXa6XRNbX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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