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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1127b9a3b3bd38d0b2d8c8c5c10fdbd01c7a34d639fbad4f63bf471fe9c23aec' 
  AND token = 'iMD0sFtmn50Fbj7HXax9i0d043/HmRd+4c9pvTpIT8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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