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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c74725967f88c3469dd9e718124d1ea3fed92793534befde52115d83f34bdf' 
  AND token = 'rbpB8f5mBH3oyEHGo7jhF/Q9H1ie6Ep54xYt/F2U2fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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