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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4eb9d7e4647ce7cc82d9becdc79d871ed5cf2aed2016e9ca60738b925ff561' 
  AND token = 'oEc2reILIlZ6nAyXjKWo0mPSI907Nph/wc0/ALx3P08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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