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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4ebc7d2fcd58b56e8dc10536109416561057499365ad331201b38c99197911' 
  AND token = 'xl79nfZXU5JSN1pZ4YCV56JLy3mw01n3yWQdiZJWBfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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