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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846b71bd32ea8887b1539eba4bd0a8422fb283ae1fc2c043b68c5eaea5504e3a' 
  AND token = 'wUgnCPN2vrSvVBBQcQx1pGdojt2GPPGchrZqioBB71c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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