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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54add0a83a08ebb887702c3e49e6fbd7ba762562ffc81510277b364f472d7224' 
  AND token = '35dNLHRT5N2eIMif4eKzYruymVAKKy1x7MEmGspOmcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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