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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2482fbaeea479a1279883ad7d5ebae63032c85d93b188a854c6a5fdf0ac3e89c' 
  AND token = 'I1TaNhjxi6fTqq51vdcyYy9BMMSCFfAaPUNhI5BI8/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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