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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acc30c3671ea30d3d5ac4903f3a76a017e1c5c900101b7827a2da61ac1771e4' 
  AND token = 'snkKmvg07zlpdqaE2bSb8MatWbI3uZ2jPykn563WVlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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