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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1512ac232df7b7226fcb32da55f2968b92b51702f9bc340e72d616c109d40187' 
  AND token = 'GY67fInZNFqlnvdnfX718j3mkc0y9T02rfn3xURoBGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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