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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a46c1d154692e148a4ed6001eef73cfe213fc9da610bdd65cb7011e2d446474' 
  AND token = '1bL++sWjW7Xf2REuK50kwHavE4L71r/ZpqmP6i7qhjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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