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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb45cb651db017d3a2d3e9b531795c769ee9e262a9c2c3362cda8582b268174' 
  AND token = 'RFGPewgdSw82B4/4perDL7J4DSbkeD1al1X/7Kg4T2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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