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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c057d0ed2cd33e3d4ffa613ec0f7302085101d4209fabc9a59e79fe67ea562' 
  AND token = 'tSBg64dZkz9gAj8yAFHAF8wOlFzVs1/zFgI+tSmMojI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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