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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531b1a581021d46d92b96f23953d1b04a12e103b81eb606ea2ab02e81769e884' 
  AND token = '7ZKEAWnhgjgVrerVChUA71NgMA++38jUVvCixtNb5Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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