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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269cc9f60e80504f68b482d7797de8ca5e2b833a4346bb18ce5e666bd4b19dab' 
  AND token = 'YKOQCGjShelfBHQKd6Zw2Ta18lLb4D5nQM6+OxNmtuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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