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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84775d1ead53c9b342a03d55f79d6811396c01b52c49e9d8fa9636e4cc8d871d' 
  AND token = 'dRHd++oNr3VHeGq85oOjmkrDYkze+Fwu9EjM+9GpN4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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