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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c61d5981679cfe918060e92553fadd8586a90a50940bb77fc1b2d0d6384257f' 
  AND token = 'wbHCWchkH0QcT/IVRTQnUuEZN7bcEP86NxyL64xbMmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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