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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a605571d0523880de86383dc5dacf1263d086703d1ba35e18c34f5fc5ec5e9b9' 
  AND token = 'Gybrl0jcoTOmymTAfcZOGPZ2cwP+e8f0/B2w4a8hcQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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