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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ea0441d409df8638ea4a62122c5ba7dfff82c7af1c9c0cbc1f59374e983219' 
  AND token = 'yDzJgFrUicCVFC8V7J3kDvEs5pFEmu+kPWBk2+UeV4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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