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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e409b5d4f73621cdd49ed4e242f3ceb58ff096efe45f9dc5a37103be1c7f53d8' 
  AND token = 'ADhRI0oHK372/R7E6/bVfkszd4SGy6g3q4B5OijM3CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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