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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d9b990649c0e71b09abc89dd32624f7e808d1be5ec1135b4a0b8959e0a1a1a' 
  AND token = 'uRVp6W+V4E9cVlsROrOEirli/K0jWGs3IkgxvkyJddI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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