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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647fcbb8aabbac1e3c59ff7fd67a7082a3de28a5fe5dbb0b092957b639e21a42' 
  AND token = 'mRDqleArEUPC2xlug0FVm+Irt4JAn+19anp5/vDaRm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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