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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7a06f772bfe01f80d396dc96aa5da8ab89481126224bef7d1c723d7f748bfe' 
  AND token = 'x5ab4Hk1u6ubRXZctV2zUswUoaVhuLH1zI9kUP48oTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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