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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4666aee96f3fdcdbc51f3d3b5aa28f3625d0c73b2c224d8feeb780e7688b14c9' 
  AND token = 'r0guhr6qWQbSHs/Cd7fmqa9huDbfnC9EGLa9AH2Q+to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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