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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaea37a1c30631a6951026775716ca92467f2919ac7db1b16d8ed278b3584672' 
  AND token = 'hnt/RZM7k07izNPi2M1urOaHI2PisXu8VBw9wUkyTh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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