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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b020b2969c8f504d318ecd80c142cbb296608af9656ffc07d27435127ece750a' 
  AND token = 'xt8pnah8iwTtoAZcIZ7F9DGwhdLpB9s0dVGr3r7fBz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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