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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d792a46baee48818ccab5a3f6547742abaaf1ccf38fcb398193529f0cbd96b3' 
  AND token = 'o2j3sY9QP4e82r2vzL6g0dMh13iL3awTdLJ/1u5lzmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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