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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2f0563b675ddc8d98a502fc35f70b8df6a28897ab933d8caf30c4e3a0578bb' 
  AND token = 'x97HBzVqRZMFtMrkTM6vRd4P0+0XDv0Yl/d7nC2flSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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